Malicious PDF — malware analysis report

Static analysis result for SHA-256 c21314bf03bca793…

MALICIOUS

PDF

69.3 KB Created: 2021-09-05 22:04:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 66d3fdff66b5575fdd685d6b96bdb26d SHA-1: 2ef2ec13dc9d866c27a46359bd7daff37e0aa102 SHA-256: c21314bf03bca793f37d437abfb7e7e125b0e4c2d5ef0f9338f15cc2ac3cdc97
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as a phishing trojan by ClamAV. Static analysis revealed it functions as a link farm, containing numerous URLs pointing to various websites. Several of these URLs lead to compromised WordPress installations, suggesting an attempt to host malicious content or redirect users to phishing sites. The presence of multiple distinct hosts and the use of UTM parameters indicate a broad phishing or distribution campaign.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3165

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://philabc.ru/uplcv?utm_term=homonyms+worksheets+for+grade+5+pdf PDF link annotation
    • http://baltic-rt.ru/ckfinder/userfiles/files/65785015945.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7b08d2113---vudop.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609067744badb---telawaxejub.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/rodiwubajudanuwob.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/a58d3eb7bdaed652d084aef5426f99a7/95204070204.pdfIn PDF document text
    • http://alexanderjamesbackcatalogue.com/userfiles/file/bekusozin.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210429174336125.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161028f6b6bf15---tanuwotilon.pdfIn PDF document text
    • https://zegabilisim.com/calisma2/files/uploads/52050553858.pdfIn PDF document text
    • http://downtowncincyhotels.com/core_degree/admin/images/cms_imagesfiles/60108859643.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608464ce862fc---77001007771.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/jotizugifozon.pdfIn PDF document text
    • http://dekobonner.de/userfiles/file/40717781561.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/3a2846441b08e64adb1a53d8d0e7c9c5/gekase.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/5e6a1be5e7958b9f5463cb81f9cbbeba/taluri.pdfIn PDF document text
    • http://panda-es.tokyo/yamituki-n/uploads/files/76397460051.pdfIn PDF document text
    • http://pokwuttibut.com/file_media/file_image/file/75707400895.pdfIn PDF document text
    • https://isitekmuhendislik.com/userfiles/file/6379394420.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbfb5587dd---55843127400.pdfIn PDF document text
    • http://allasclub.com/campannas/file/pofexomomelotos.pdfIn PDF document text
    • http://palenice.net/obrazky_clanky/file/suxevapeki.pdfIn PDF document text
    • http://edu-soft.ru/site/htmlimages/file/nopidanerowinivajoluseti.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16071aecfe850d---27506041873.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f55c02c20b---29918558302.pdfIn PDF document text
    • http://youngdongtec.com/userfiles/file/divunosifogis.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/73c9c9d29a641f1aaf2c1445522eb8c7/fofurufan.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bf66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF66 11224 bytes
SHA-256: 5913afafc33c2730357ef3eb2e2cc59b2ee29c948e751cea2bc491cf69e99695
font_01_sfnt_off0000d965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD965 16436 bytes
SHA-256: bc796438ddaa90869b12e5e424ef21c39de4a282f615a816f585f46a4f3f9253